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Sheet supplying device

a technology of supplying device and supplying roller, which is applied in the direction of transportation and packaging, thin material processing, and article separation, can solve the problems of no longer effective separation function of friction pad and separating roller, and achieve the effect of reliably separating and conveying a recording medium

Active Publication Date: 2006-08-17
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] In view of the foregoing, it is an object of the present invention to provide a sheet supplying device capable of reliably separating and conveying a recording medium one sheet at a time, and an image forming apparatus provided with the sheet supplying device.

Problems solved by technology

Hence, the separating function of the friction pad and separating roller is no longer effective from this point, allowing the second sheet or subsequent sheets of paper to be conveyed along with the first sheet.

Method used

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Examples

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Embodiment Construction

[0033] A sheet supplying device and an image forming apparatus according to an embodiment of the present invention will be described while referring to the accompanying drawings. In the following description, the expressions “front”, “rear”, “right”, and “left” are used to define the various parts when the image forming apparatus is disposed in an orientation in which it is intended to be used.

[0034] 1. Overall Structure of the Image Forming Apparatus

[0035]FIG. 1 is a side cross-sectional view of a laser printer 1. As shown in FIG. 1, the laser printer 1 includes a main casing 2 and, within the main casing 2, a feeding unit 4 for supplying sheets of a paper 3, an image forming unit 5 for forming images on the paper 3 supplied by the feeding unit 4, and the like.

[0036] (1) Main Casing

[0037] An access opening 6 formed in one side wall of the main casing 2 for inserting and removing a process cartridge 20 described later, and a front cover 7 capable of opening and closing over the ...

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PUM

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Abstract

A shifting mechanism shifts at least one of a sheet accommodating portion and feeding portion, thereby changing a position of the feeding portion relative to sheets. A pressure changing mechanism changes pressure between first and second separating portions. A contact force controlling portion controls the shifting mechanism to provide a first contact force when the feeding portion starts a feeding operation, and controls the shifting mechanism, at a first timing, to reduce the contact force from the first contact force to a second contact force. A pressure controlling portion controls the pressure changing mechanism to provide a first pressure between the first and second separating portions when the feeding portion starts the feeding operation, and controls the pressure changing mechanism, at a second timing, to reduce the pressure from the first pressure to a second pressure while nipping the separated sheet between the first and second separating portions.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a sheet supplying device for separating and supplying sheets of a recording medium one sheet at a time. The present invention also relates to an image forming apparatus equipped with the sheet supplying device. [0003] 2. Description of Related Art [0004] Japanese examined patent-application publication No. HEI-8-13565 (Japanese unexamined patent-application publication No. HEI-2-48974) describes a conventional paper-feeding mechanism having a feeding roller that rotates in contact with the surface of stacked sheets of paper in order to feed the sheets of paper, and a separating roller that rotates to convey the paper one sheet at a time as the paper supplied by the feeding roller becomes interposed between the separating roller and a friction pad. When conveying rollers positioned downstream of the separating roller receive and begin to convey the paper, the feeding roller is lifted ...

Claims

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Application Information

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IPC IPC(8): B65H3/06B65H3/52B65H1/08
CPCB65H1/14B65H3/0684B65H3/5223B65H2403/51B65H2515/34B65H2220/02B65H2220/08B65H2701/1912
Inventor HATTORI, MAKOTO
Owner BROTHER KOGYO KK